TROPICAL AMERICAN ORCHIDS 
guste oblanceolatum, satis coriaceum, in petiolum sulcatum 
contractum, apice obscure bilobatum apiculo interjecto. 
Pedunculus elongatus folium superans, gracilis. Pedicelli 
fasciculati, bracteis nervosis imbricantibus subtenti. Flores 
periodic!, succedanei, eodem tempore singuli aperti. Sepala 
lateralia usque ad medium cohaerentia, in laminam ovatam 
bifidam leviter concavam extus bicarinatam expansa. Se- 
palum dorsale oblongo-lanceolatum, acutum, apice leviter 
incrassatum, extus per medium carinatum, trinervium. 
Petala dolabriformia vel subrhomboidea, apice valde in- 
crassata et teretia, extus minute glandulosa, binervia. La- 
bellum breviter unguiculatum, oblongum, apice rotundatum, 
margine obscure denticulatum, supra dense et breviter 
glandulosum praecipue per medium disci, utrinque prope 
marginem leviter carinatum carinis glanduloso-fimbriatis. 
Columna usque ad apicem leviter dilatata, apice trilobulata, 
lobo posteriore breviter eroso. 
Rhizome abbreviated. Roots whitish, fibrous, spread¬ 
ing. Secondary stems caespitose, about 4 mm. long, con¬ 
cealed by closely oppressed tubular sheaths which soon 
break down into spreading fibres, monophyllous. Leaf with 
the sulcate petiole 2.5-3.5 cm. long, 3.5-5 mm. wide, ob- 
lanceolate, with the apex minutely bilobed and apiculate. 
Peduncle 4-5.5 cm. long, with a closely oppressed tubular 
bract near the middle, terminated by several closely im¬ 
bricating nervose bracts which subtend the fasciculate 
pedicels of the successional flowers. Pedicels up to ten or 
more, up to 5 mm. long, slender, persistent. Ovary about 
1 mm. long. Lateral sepals 8 mm. long, 3-nerved, cohering 
to about the middle, forming a bifid ovate lamina which is 
about 3 mm. wide at the middle; free portion of each sepal 
triangular, acute, 4 mm. long, lightly carinate on the outer 
surface along the middle. Dorsal sepal 7.5 mm. long, about 
2 mm. wide near the middle, oblong-lanceolate, acute, 
3-nerved, with the central nerve prominent and shortly de¬ 
current on the ovary. Petals 3.5 mm. long, 1.5 mm. wide 
near the middle, dolabriform or subrhomboidal in outline, 
the anterior margin protuberant, apex terete, outer surface 
minutely glandulose. Labellum about 4 mm. long, 1.25 mm. 
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